Organic light emitting device and manufacturing method thereof

ABSTRACT

Provided are an organic light emitting device and a manufacturing method thereof. The organic light emitting device includes a first display substrate, a second display substrate, and a first adhesive force improving member. The first display substrate includes a first substrate, a first electrode, organic light emitting patterns, a first spacer, and a second electrode. The first electrode is formed on an entire surface of the first substrate, and the organic light emitting patterns are disposed on the first electrode. The first spacer corresponds to the organic light emitting pattern and is disposed on the first electrode. The second electrode covers the organic light emitting patterns and the first spacer. The second display substrate includes a second substrate, and a first driving signal delivery part. The first adhesive force improving member electrically/physically couples the second electrode to the first driving signal delivery part.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to an organic light emitting device and amanufacturing method of the organic light emitting device.

2. Description of the Related Art

Recently, an information processing apparatus that capable of processinga large amount of data within a short time and a display device fordisplaying data processed by the information processing apparatus havebeen developed.

Generally, display devices may are classified into analog displaydevices and digital display devices. Cathode ray tubes (CRTs) is arepresentative the analog display device, and a liquid crystal displaydevice (LCD), an organic light emitting device (OLED), and a plasmadisplay panel (PDP) are representative the digital display devices

Recently, the digital display devices having a small volume andlightweight compared to analog display devices are widely used.

Furthermore, recently, technology development for OLEDs of digitaldisplay devices is under rapid development.

A related OLED displays an image using an organic light emitting layerinterposed between a pair of electrodes. Also, to display a full colorimage using a related art organic light emitting layer, the related artOLED includes a switching transistor, a driving transistor, and acapacitor. Also, since two transistors, a capacitor, and organic lightemitting elements are formed on the same substrate, a manufacturingmethod thereof is complicated, and an aperture ratio of the organiclight emitting layer may reduce.

To solve these disadvantages, there has developed an OLED where aswitching transistor, a driving transistor, and a capacitor are formedon one substrate, while organic light emitting elements are formed onthe other substrate. In detail, the switching transistor, the drivingtransistor, and the capacitor are disposed on a lower substrate, whilethe organic light emitting elements are formed on an upper substratefacing the lower substrate.

In an organic light emitting device having the above-describedconstruction, a drive signal is transferred from a conductor connectedto a driving transistor of a lower substrate to an electrode of anorganic light emitting element of an upper substrate, so that an imageis displayed from the organic light emitting device.

However, an image generated from an OLED where elements are formed ontwo substrates, respectively, may be frequently interrupted by a factorsuch as temperature rise, impact, vibration, and humidity absorption.The reason an image is interrupted is that a conductor connected to adriving transistor of a lower substrate is separated from an electrodeof an organic light emitting element of an upper substrate as aninterval between the two substrates is widened.

SUMMARY OF THE INVENTION

Accordingly, the present invention is directed to an organic lightemitting device and a manufacturing method thereof that substantiallyobviate one or more problems due to limitations and disadvantages of therelated art.

An object of the present invention is to provide an organic lightemitting device that prevents elements emitting light and formed on twosubstrates facing each other from being separated from one another whenthe substrates are deformed.

Another object of the present invention is to provide a method formanufacturing an organic light emitting device having theabove-described construction.

Additional advantages, objects, and features of the invention will beset forth in part in the description which follows and in part willbecome apparent to those having ordinary skill in the art uponexamination of the following or may be learned from practice of theinvention. The objectives and other advantages of the invention may berealized and attained by the structure particularly pointed out in thewritten description and claims hereof as well as the appended drawings.

To achieve these objects and other advantages and in accordance with thepurpose of the invention, as embodied and broadly described herein,there is provided an organic light emitting device including a firstdisplay substrate, a second display substrate, a first adhesive forceimproving member, a second adhesive force improving member, and asealing member. The first display substrate includes a first substrate,a first electrode formed on an entire surface of the first substrate, anorganic light emitting pattern disposed on the first electrode, a firstspacer corresponding to the organic light emitting pattern and disposedon the first electrode, a second electrode covering the organic lightemitting pattern and the first spacer, a second spacer disposed on thefirst electrode, and a connecting member covering the second spacer andconnected to the first electrode. The second display substrate includesa second substrate facing the first substrate, a first driving signaldelivery part disposed on the second substrate and facing the firstspacer, and a second driving signal delivery part facing the secondspacer. The first adhesive force improving member couples the secondelectrode to the first driving signal delivery part. The second adhesiveforce improving member couples the first electrode to the second drivingsignal delivery part. The sealing member seals the first and seconddisplay substrates.

In another aspect of the present invention, there is provided a methodfor manufacturing an organic light emitting device, the methodincluding: manufacturing a first display substrate by forming a firstelectrode over an entire surface of a first substrate, forming a firstspacer on the first electrode and a second spacer separated from thefirst spacer, forming organic light emitting patterns corresponding tothe first spacer on the first electrode, forming a second electrodecovering the organic light emitting pattern and the first spacer,forming a connecting member covering a second spacer and connected tothe first electrode; manufacturing a second display substrate by forminga first driving signal delivering part facing the first spacer on asecond substrate facing the first substrate, and forming a seconddriving signal delivering part facing the second spacer; bonding thesecond electrode and the first driving signal delivering part using afirst adhesive force improving member, and bonding the first electrodeand the second driving signal delivering part using a second adhesiveforce improving member; and sealing the first and second displaysubstrates using a sealing member.

It is to be understood that both the foregoing general description andthe following detailed description of the present invention areexemplary and explanatory and are intended to provide furtherexplanation of the invention as claimed.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included to provide a furtherunderstanding of the invention and are incorporated in and constitute apart of this application, illustrate embodiment(s) of the invention andtogether with the description serve to explain the principle of theinvention. In the drawings:

FIG. 1 is a block diagram of an organic light emitting device accordingto a first embodiment of the present invention;

FIG. 2 is a cross-sectional view of FIG. 1;

FIG. 3 is a detailed cross-sectional view of the organic light emittingpatterns of FIG. 2;

FIG. 4 is a cross-sectional view of an organic light emitting deviceaccording to a second embodiment of the present invention;

FIG. 5 is a cross-sectional view of an organic light emitting deviceaccording to a third embodiment of the present invention;

FIG. 6 is a flowchart illustrating a method for manufacturing an organiclight emitting device according to a fourth embodiment of the presentinvention;

FIGS. 7 to 10 are cross-sectional views illustrating a process formanufacturing a first display substrate;

FIG. 11 is a cross-sectional view explaining manufacturing of a seconddisplay substrate according to a fourth embodiment of the presentinvention; and

FIG. 12 is a cross-sectional view explaining elements of a first displaysubstrate are electrically connected to elements of a second displaysubstrate according to a fourth embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

Reference will now be made in detail to the preferred embodiments of thepresent invention, examples of which are illustrated in the accompanyingdrawings. The present invention is not limited to the followingembodiments but a person of ordinary skill in the art would realize thepresent invention in various other forms within the scope of the presentinvention. In the accompanying drawings, a first display substrate, asecond display substrate, a first adhesive force improving member, asecond adhesive force improving member, a sealing member, and otherstructures are exaggerated in size for clarity of the present invention.It will also be understood that when a first display substrate, a seconddisplay substrate, a first adhesive force improving member, a secondadhesive force improving member, a sealing member, and other elementsare referred to as being ‘on’ or ‘under’ a substrate, they may bedirectly ‘on’ or ‘under’ the substrate, or another first displaysubstrate, second display substrate, first adhesive force improvingmember, second adhesive force improving member, sealing member, andother elements may be additionally formed on the substrate. Also, thoughterms like a first, a second, and a third are used to describe variousregions and layers in various embodiments of the present invention, theregions and the layers are not limited to these terms. These terms areused only to tell one region or layer from another region or layer.Therefore, the terms like a first and a second may be selectively orexchangeably used for a first display substrate, a second displaysubstrate, a first adhesive force improving member, a second adhesiveforce improving member, and other structures.

Organic Light Emitting Device

FIG. 1 is a block diagram illustrating an organic light emitting deviceaccording to a first embodiment of the present invention. FIG. 2 is across-sectional view of FIG. 1.

Referring to FIG. 1, the organic light emitting device includes at leastone switching transistor STR, a driving transistor DTR, a capacitor, anorganic light emitting element EL, a data line DL, and a power line PWin order to display an image.

The data line DL and the gate line GL are insulated from each other byan insulating layer (not shown). For example, the gate line GL isdisposed under the insulating layer, and the data line DL is disposed onthe insulating layer. The gate line GL, and the data line DL aredisposed to substantially perpendicular to each other In a plan view.The power line PW is disposed in parallel to the data line DL.

The switching transistor STR includes a gate electrode G1, a channellayer C1, a source electrode S1, and a drain electrode D1.

The gate electrode G1 is disposed under the insulating layer andbranches off from the gate line GL. The channel layer C1 is disposed onthe insulating layer and formed at a position corresponding to the gateelectrode G1. The source electrode S1 is disposed on the insulatinglayer. The source electrode S1 branches off from the data line DL. Anend portion of the source electrode S1 is electrically contacted to thechannel layer C1. The drain electrode D1 is disposed on the insulatinglayer and electrically contacted to the channel layer C1. The sourceelectrode S1 and the drain electrode D1 are spaced apart from each otherby a predetermined distance.

The driving transistor DTR includes a gate electrode G2, a channel layerC2, a source electrode S2, and a drain electrode D2.

The gate electrode G2 is disposed under the insulating layer andelectrically connected to the drain electrode D1 of the switchingtransistor STR. The channel layer C1 is disposed on the insulating layerand formed at a position corresponding to the gate electrode G2. Thesource electrode S2 is disposed on the insulating layer. A first endportion of the source electrode S2 is electrically contacted to thechannel layer C2, and a second end portion opposite to the first endportion is electrically connected to the power line PW. A first endportion of the drain electrode D2 is disposed on the channel layer C2.The first end portion of the drain electrode D2 is spaced apart from thefirst end portion of the source electrode S2. A second end portion ofthe drain electrode D2 is connected earth potentials.

A pair of electrodes of a capacitor is electrically connected to thedrain electrode D1 of the switching transistor STR and the drainelectrode D2 of the driving transistor DTR, respectively.

The organic light emitting element EL is electrically connected to thesource electrode S2 of the driving transistor DTR.

Referring to FIGS. 1 and 2, elements of the organic light emittingdevice 600 descried with reference to FIG. 1 are formed on a firstdisplay substrate 100 and a second display substrate 200, respectively.Meanwhile, the organic light emitting device 600 includes a firstadhesive force improving member 300 and a second adhesive forceimproving member 400 for improving adhesive force between elementsdistributed on the first and second display substrates 100 and 200.

The elements formed on the first display substrate 100 are describedbelow.

Referring to FIGS. 1 and 2, the organic light emitting element EL isformed on the first display substrate 100. The switching transistor STR,the driving transistor DRT, a capacitor C, the data line DL, the gateline GL, and the power line PW are formed on the second displaysubstrate 200 as illustrated in FIG. 1.

The organic light emitting element EL formed on the first displaysubstrate 100 includes a first substrate 10, a first electrode 20,organic light emitting patterns 30, a first spacer 40, a secondelectrode 50, a second spacer 60, and a connecting member 70.

The first substrate 10 includes a transparent substrate, for example. Indetail, the first substrate 10 may be a glass substrate having a plateshape. One face of the first substrate 10 that faces the second displaysubstrate 200 is defined as a first face 11. The other face of the firstsubstrate 10 that faces the first face 11 is defined as a second face12.

The first electrode 20 is disposed on the first face 11 of the firstsubstrate 10. In the present embodiment, the first electrode 20 includesa transparent conductive material. Examples of a material that may beused as the first electrode 20 include Indium Tin Oxide (ITO), IndiumZinc Oxide (IZO), and amorphous Indium Tin Oxide (a-ITO), etc. In thepresent embodiment, the first electrode 20 is formed over an entire areaof the first face 11 of the first substrate 10.

FIG. 3 is a detailed cross-sectional view of the organic light emittingpatterns of FIG. 2.

Referring to FIG. 3, the organic light emitting patterns 30 are disposedon the first electrode 20. The plurality of organic light emittingpatterns 30 may be disposed on the first electrode 20 in a matrix shape.To dispose the organic light emitting patterns 30 in a matrix shape, apartition wall (not shown) having a lattice shape may be disposed on thefirst electrode 20.

The organic light emitting patterns 30 may include a hole injectionlayer (HIL), a hole transport layer (HTL), an organic electroluminescentlayer (OEL), an electron transport layer (ETL), and an electroninjection layer (EIL). The organic light emitting patterns 30 accordingto the present embodiment may be formed by a vacuum deposition method,for example.

Referring again to FIG. 2, the first spacer 40 may be disposed on thefirst electrode 20. In detail, the first spacer 40 includes aninsulating material, and is disposed at an adjacent position to eachorganic light emitting pattern 30.

The second electrode 50 is disposed on the organic light emittingpatterns 30 and the first spacer 40 located at a position close to theorganic light emitting patterns 30. In the present embodiment, thesecond electrode 50 includes a conductor having a relatively small workfunction compared to that of the first electrode 20. In the presentembodiment, examples of a material that may be used as the secondelectrode 50 include aluminum and an aluminum alloy, etc. The secondspacer 60 is disposed on the first electrode 20. The second spacer 60 isdisposed at a position spaced apart from the first spacer 40. In thepresent embodiment, heights of the first and second spacers 40 and 60measured from the first electrode 20 are substantially the same.

The connecting member 70 covers the second spacer 60 and the connectingmember 70 is electrically connected to the first electrode 20. In thepresent embodiment, examples of a material that may be used as theconnecting member 70 include aluminum and an aluminum alloy, etc.

Elements disposed on the second display substrate 200 are describedbelow.

Referring again to FIG. 2, the switching transistor STR, the drivingtransistor DRT, a capacitor C, the data line DL, the gate line GL, andthe power line PW are formed on the second display substrate 200 asdescribed in detail with reference to FIG. 1.

A first driving signal delivery part 210, which is a portion of thesource electrode S2 of the driving transistor DTR disposed on the seconddisplay substrate 200 is disposed to face the first spacer 40. A seconddriving signal delivery part 220, which is a portion of the power linePW, is disposed to face the second spacer 60.

In detail, the first driving signal delivery part 210, which is aportion of the source electrode S2 of the driving transistor DTR iselectrically connected to the second electrode 50 covering the firstspacer 40. The second driving signal delivery part 220, which is aportion of the power line PW, is electrically connected to theconnecting member 70 covering the second spacer 60.

An operation of the organic light emitting device 600 including elementsdistributed over the first and second display substrates 100 and 200will be briefly described with reference to FIGS. 1 and 2.

First, a driving signal for displaying an image is applied via the dataline DL, so that a drive signal is applied to the source electrode S1 ofthe switching transistor STR. Subsequently, a turn-on signal for turningon the switching transistor STR is applied to the gate line GL, so thatthe driving signal applied to the source electrode S1 is provided to thedrain electrode D1 via the channel layer C1 where a channel is formed.

The driving signal provided to the drain electrode D1 is applied to thegate electrode G2 of the driving transistor DTR to form a channel at thechannel layer C2 of the driving transistor DTR and simultaneouslycharges the capacitor C.

Meanwhile, since a second driving signal delivery part 220, which is aportion of the power line PW, is connected to the conductive connectingmember 70 covering the second spacer 60, power is applied to the firstelectrode 20 of the first display substrate 100 from the second displaysubstrate 200 via the power line PW.

Therefore, in the case that a channel is formed in the channel layer C2of the driving transistor DTR, a forward current is applied to theorganic light emitting element EL, so that light is emitted from theorganic light emitting element EL.

The first adhesive force improving member 300 not only electricallyconnects the second electrode 50 of the first display substrate 100 tothe first driving signal delivery part 210 of the second displaysubstrate 200′, but also solidly couples the second electrode 50 to thefirst driving signal delivery part 210 physically and chemically. Indetail, the first adhesive force improving member 300 may be molten tocouple to the second electrode 50 and the first driving signal deliverypart 210. Particularly, the first adhesive force improving member 300prevents the second electrode 50 and the first driving signal deliverypart 210 from being separated from each other even when an intervalbetween the first and second display substrates 100 and 200 is wideneddue to twisting, impact, vibration, and thermal expansion caused bytemperature rise.

In the present embodiment, the first adhesive force improving member 300may be formed of metal of a low melting point molten at a temperaturerange of about 300° C. to about 450° C. Examples of metal of a lowmelting point that may be used as the first adhesive force improvingmember 300 include In, Zn, Pb, Ca, Mg, and Sn, etc.

Referring again to FIG. 2, the first adhesive force improving member 300may entirely cover the second electrode 50. The second adhesive forceimproving member 400 not only electrically connect the connecting member70 of the first display substrate 100 to the second driving signaldelivery part 220 of the second display substrate 200, but also solidlycouples them physically and chemically. In detail, the second adhesiveforce improving member 400 is molten to electrically connect theconnecting member 70 to the second driving signal delivery part 220. Thesecond adhesive force improving member 400 prevents the connectingmember 70 and the second driving signal delivery part 220 from beingseparated from each other even when an interval between the first andsecond display substrates 100 and 200 is widened due to twisting,impact, vibration, and thermal expansion caused by temperature rise.

In the present embodiment, the second adhesive force improving member400 may be formed of metal of a low melting point molten at atemperature range of about 300° C. to about 450° C. Examples of metal ofa low melting point that may be used as the second adhesive forceimproving member 400 include In, Zn, Pb, Ca, Mg, and Sn, etc.

Referring again to FIG. 2, the second adhesive force improving member300 may entirely cover the connecting member 70.

A sealing member 500 is interposed between the first display substrate100 and the second display substrate 200 to prevent harmful materialssuch as oxygen, moisture, and hydrogen from penetrating between thefirst and second display substrates 100 and 200.

A porous member capable of adsorbing harmful materials using pluralityof holes may be mixed into the sealing member 500 according to thepresent embodiment.

FIG. 4 is a cross-sectional view of an organic light emitting deviceaccording to a second embodiment of the present invention. An organiclight emitting device according to the second embodiment of the presentinvention has substantially the same construction of the above-describedorganic light emitting device according to the first embodiment exceptthe first and second adhesive force improving members. Therefore, samenames and reference numerals are used for the same construction as thatof the first embodiment.

Referring to FIGS. 1 and 4, the organic light emitting device 600includes a first display substrate 100 including an organic lightemitting element EL, and a second display substrate 200 including aswitching transistor STR, a driving transistor DTR, a capacitor, a dataline DL, a gate line GL, and a power line PW.

Also, the organic light emitting device 600 further includes a firstadhesive force improving member 310 and a second adhesive forceimproving member 410.

In the present embodiment, the first adhesive force improving member 310may be disposed between the second electrode 50 and a first drivingsignal delivery part 210. Also, the second adhesive force improvingmember 410 may be locally disposed between a connecting member 70 and asecond driving signal delivery part 220.

In detail, the first adhesive force improving member 310 may be locallydisposed on an upper end of the protruding second electrode 50 thatcorresponds to a first spacer 40. The second adhesive force improvingmember 410 may be locally disposed on an upper end of the connectingmember 70 that corresponds to the second spacer 60.

FIG. 5 is a cross-sectional view of an organic light emitting deviceaccording to a third embodiment of the present invention. The organiclight emitting device according to the third embodiment of the presentinvention has substantially the same construction of the above-describedorganic light emitting device according to the second embodiment exceptthe first and second adhesive force improving members. Therefore, samenames and reference numerals are used for the same construction as thatof the second embodiment.

Referring to FIGS. 1 and 5, the organic light emitting device 600includes a first display substrate 100 including an organic lightemitting element EL, and a second display substrate 200 including aswitching transistor STR, a driving transistor DTR, a capacitor, a dataline DL, a gate line GL, and a power line PW.

Also, the organic light emitting device 600 further includes a firstadhesive force improving member 320 and a second adhesive forceimproving member 420.

In the present embodiment, the first adhesive force improving member 320may be locally disposed on an upper surface of a first driving signaldelivery part 210, which is a portion of a source electrode S2 of thedrain transistor DTR disposed on the second display substrate 200.Unlike this, the first adhesive force improving member 320 maycompletely cover the surface of the first driving signal delivery part210. Also, the second adhesive force improving member 420 is disposed toface a second spacer 60, and locally disposed on an upper surface of thesecond driving signal delivery part 220, which is a portion of the powerline PW. Unlike this, the second adhesive force improving member 420 maycompletely cover the surface of the second driving signal delivery part220.

Method for Manufacturing Organic Light Emitting Device

FIG. 6 is a flowchart illustrating a method for manufacturing an organiclight emitting device according to a fourth embodiment of the presentinvention, and FIGS. 7 to 10 are cross-sectional views illustrating aprocess for manufacturing a first display substrate.

Referring to FIG. 6, a first display substrate 100 is manufactured inorder to manufacture an organic light emitting device in S10. Of course,a second display substrate in S20, which will be described later, may bemanufactured prior to the first display substrate.

Referring to FIGS. 6 and 7, a first electrode 20 is formed on an entiresurface of the first substrate 10. In the present embodiment, the firstsubstrate 10 may be a transparent glass substrate, for example. To formthe first electrode 20, a transparent conductive layer (not shown) isformed on an entire surface of the first substrate 10. The transparentconductive layer may be formed on the first substrate 10 using chemicalvapor deposition (CVD) or sputtering. After formed on the firstsubstrate 10, the transparent conductive layer is patterned usingphotolithography to form the transparent and conductive first electrode20 on the first substrate 10.

Referring to FIG. 8, after the first electrode 20 is formed on the firstsubstrate 10, a first spacer 40 and a second spacer 60 separated fromthe first spacer 40 are formed on the first electrode 20.

To form the first spacer 40 and the second spacer 60, a thin insulatinglayer (not shown) covering the first electrode 20 is formed on the firstsubstrate 10. In the present embodiment, the insulating layer mayinclude an organic material including photoresist.

The thin insulating layer covering the first electrode 20 is patternedusing photolithography including an exposure process and a developingprocess to simultaneously form the first spacer 40 and the second spacer60 protruding from the first substrate 10 on the first substrate 10.

In the present embodiment, since the first spacer 40 and the secondspacer 60 are formed by patterning the insulating layer, they havesubstantially the same height. In the present embodiment, the firstspacer 40 is formed at every position corresponding to a plurality oforganic light emitting patterns, which will be described below.

Referring to FIG. 9, after the first and second spacers 40 and 60 areformed on the first electrode 20, organic light emitting patterns 30 areformed on the first electrode 20.

In the present embodiment, an EIL is formed on the first electrode 20,an ETL is formed on the EIL, an organic electroluminescent layer OEL isformed on the ETL, an HTL is formed on the OEL, and a HIL is formed onthe HTL, so that the organic light emitting patterns 30 aremanufactured. In the present embodiment, the first electrode 20 provideselectrons to the EIL.

Referring to FIG. 10, after the organic light emitting patterns 30 ismanufactured, a metal layer (not shown) having a small work functioncompared to that of the first electrode 10 is formed over an entiresurface of the first substrate 10 to cover the organic light emittingpatterns 30. In the present embodiment, the metal layer is formed usingsputtering. Examples of a material that is used as the metal layerinclude aluminum and an aluminum alloy.

Subsequently, the metal layer is etched using photolithography to form asecond electrode 50 and a connecting member 70 on the first substrate10. In the present embodiment, the second electrode 50 is insulated fromthe first electrode 20, and covers the organic light emitting patterns30 and the first spacer 40. The connecting member 70 covers the secondspacer 40 and is electrically connected to the first electrode 20.Through the above process, the first display substrate 100 ismanufactured. In the present embodiment, the second electrode 50 and theconnecting member 70 are electrically insulated when they are etchedusing photolithography.

FIG. 11 is a cross-sectional view explaining manufacturing of a seconddisplay substrate according to a fourth embodiment of the presentinvention.

Referring to FIGS. 1, 6, and 11, the switching transistor STR, thedriving transistor DTR, the capacitor, the data line DL, the gate lineGL, and the power line PW are formed on the second substrate 205 in S20as described with reference to FIG. 1.

A first driving signal delivery part 210, which is a portion of thesource electrode S1 of the driving transistor DTR, is formed on thesecond substrate 205 to face the first spacer 40. A second drivingsignal delivery part 220, which is a portion of the power line PW, isdisposed to face the second spacer 60. Through the above process, thesecond display substrate 200 is manufactured.

FIG. 12 is a cross-sectional view explaining elements of a first displaysubstrate are electrically connected to elements of a second displaysubstrate according to a fourth embodiment of the present invention.

Referring to FIGS. 1, 6, and 12, a first adhesive force improving member300 is formed on the second electrode 50, and a second adhesive forceimproving member 400 is formed on the connecting member 70 toelectrically connect and physically couple the second electrode 50 andthe connecting member 70, which are the elements of the first displaysubstrate, to the first driving signal delivery part 210 and the seconddriving signal delivery part 220, which are the elements of the seconddisplay substrate in S30.

In the present embodiment, each of the first and second adhesive forceimproving members 300 and 400 includes metal of a low melting point thatis molten at a temperature range of about 300-450° C. In the presentembodiment, examples of a material that may be used as the first andsecond adhesive force improving members 300 and 400 include In, Zn, Pb,Ca, Mg, and Sn.

In the present embodiment, the first and second adhesive force improvingmembers 300 and 400 may be selectively formed on the second electrode 50and the connecting member 70 through evaporation using a shadow mask,for example.

In the present embodiment, the first and second adhesive force improvingmembers 300 and 400 may be formed over entire surfaces of the secondelectrode 50 and the connecting member 70 of the first display substrate100, for example. Unlike this, the first and second adhesive forceimproving members 300 and 400 may be selectively formed only on asurface of the second electrode 50 of the first display substrate 100,and portions of the connecting member 70 that contact the first andsecond driving signal delivery parts 210 and 220. Unlike this, the firstand second adhesive force improving members 300 and 400 may be formed onthe first and second driving signal delivery parts 210 and 220 of thesecond display substrate 200.

After the first and second adhesive force improving members 300 and 400are formed on the second electrode 50 and the connecting member 70, asealing member 500 is disposed on an edge of the second displaysubstrate 200. Subsequently, the first adhesive force improving member300 of the first display substrate 100 contacts the first driving signaldelivery part 210 of the second display substrate 200, and the secondadhesive force improving member 300 of the first display substrate 100contacts the second driving signal delivery part 210 of the seconddisplay substrate 200.

Subsequently, the first and second display substrates 100 and 200 areheated to a temperature range of about 300-450° C., so that the firstand second adhesive force improving members 300 and 400 disposed on thesecond electrode 50 and the connecting member 70 of the first displaysubstrate 100 are molten. Through the above process, the secondelectrode 50 of the first display substrate 100 is electricallyconnected and physically coupled to the first driving signal deliverypart 210 of the second display substrate 200. The connecting member 70of the first display substrate 100 is electrically connected andphysically coupled to the second driving signal delivery part 220 of thesecond display substrate 200.

As described above in detail, two display substrates are not separatedfrom each other when elements of an organic light emitting device aredistributed on the two display substrates, so that interruption of animage is prevented.

It will be apparent to those skilled in the art that variousmodifications and variations may be made in the present invention. Thus,it is intended that the present invention covers the modifications andvariations of this invention provided they come within the scope of theappended claims and their equivalents.

1. An organic light emitting device comprising: a first displaysubstrate including a first substrate, a first electrode formed on asurface of the first substrate, organic light emitting patterns disposedon the first electrode, a first spacer corresponding to the organiclight emitting patterns and disposed on the first electrode, and asecond electrode covering the organic light emitting patterns and thefirst spacer; a second display substrate including a second substratefacing the first substrate, and a first driving signal delivery partdisposed on the second substrate and facing the first spacer; and afirst adhesive force improving member for electrically/physicallycoupling the second electrode to the first driving signal delivery part.2. The organic light emitting device according to claim 1, wherein thefirst adhesive force improving member covers the second electrode. 3.The organic light emitting device according to claim 1, wherein thefirst adhesive force improving member is locally disposed on a portionof the second electrode that contacts the first driving signal deliverypart.
 4. The organic light emitting device according to claim 1, whereinthe second electrode includes one selected from the group consisting ofaluminum and an aluminum alloy.
 5. The organic light emitting deviceaccording to claim 1, wherein the first adhesive force improving memberincludes one selected from the group consisting of In, Zn, Pb, Ca, Mg,and Sn.
 6. The organic light emitting device according to claim 1,wherein the first electrode is formed of a transparent conductive metaloxide.
 7. The organic light emitting device according to claim 6,wherein the first electrode includes one selected from the groupconsisting of Indium Tin Oxide, Indium Zinc Oxide, and amorphous IndiumTin Oxide.
 8. The organic light emitting device according to claim 1,wherein the organic light emitting patterns comprise an electroninjection layer disposed on the first electrode, an electron transportlayer disposed on the electron injection layer, an organicelectroluminescent layer disposed on the electron transport layer, ahole transport layer disposed on the organic electroluminescent layer, ahole injection layer disposed on the hole transport layer and connectedto the second electrode.
 9. The organic light emitting device accordingto claim 1, wherein the first adhesive force improving member isdisposed on the first driving signal delivery part.
 10. The organiclight emitting device according to claim 1, wherein the first displaysubstrate comprises a second spacer disposed on the first electrode, anda connecting member covering the second spacer and connected to thefirst electrode, and the second display substrate comprises a seconddriving signal delivery part facing the second spacer, and theconnecting member is electrically/physically coupled to the seconddriving signal delivery part using a second adhesive force improvingmember.
 11. The organic light emitting device according to claim 10,wherein the second adhesive force improving member covers the connectingmember.
 12. The organic light emitting device according to claim 10,wherein the second adhesive force improving member is locally disposedon a portion of the connecting member that contacts the second drivingsignal delivery part.
 13. The organic light emitting device according toclaim 10, wherein the connecting member includes one selected from thegroup consisting of aluminum and an aluminum alloy.
 14. The organiclight emitting device according to claim 10, wherein the second adhesiveforce improving member includes one selected from the group consistingof In, Zn, Pb, Ca, Mg, and Sn.
 15. The organic light emitting deviceaccording to claim 10, wherein the second adhesive force improvingmember is disposed on the second driving signal delivery part.
 16. Theorganic light emitting device according to claim 10, further comprisinga sealing member for sealing the organic light emitting patternsinterposed between the first and second display substrates.